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Fixes color picker hue drift at low alpha values (#8208)
<!-- Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/main/CONTRIBUTING.md) before opening a Pull Request! * Keep your PR:s small and focused. * The PR title is what ends up in the changelog, so make it descriptive! * If applicable, add a screenshot or gif. * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`, or a new example. * Do NOT open PR:s from your `master` branch, as that makes it hard for maintainers to test and add commits to your PR. * Remember to run `cargo fmt` and `cargo clippy`. * Open the PR as a draft until you have self-reviewed it and run `./scripts/check.sh`. * When you have addressed a PR comment, mark it as resolved. Please be patient! I will review your PR, but my time is limited! --> * [x] I have followed the instructions in the PR template At low apha values, premultiplied colors lose precision. This PR makes the color picker use unmultiplied colors internally. Before: https://github.com/user-attachments/assets/4617a355-daa9-4911-86e6-518ac6867014 After: https://github.com/user-attachments/assets/d9681b01-50d8-418e-b5a5-79b4bd1bbddf
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size 35943
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